I switched from another carrier to tmobile in january 2017 and paid the remaining device payment plan to the old carrier and sent my iphone to t-mobile for the promotional rebate. I have submitted the last bill as t-mobile requested promptly and again in oct 2017. However, I have not received my rebate, as of november 2017. I have called every one I was told, have chatted with at least 10+ t-mobile customer support reps. After countless hours, I have a feeling the promotion zips people and there is a complain/customer service blackhole ahead of you which does not lead to anywhere. Please help, if you are/were in the same boat and how you came out of it as t-mobile sure does does not want me out of it.